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About Screw Fasteners:
A screw is a type of fastener, typically made of metal, and characterized by a helical ridge, known as a male thread (external thread) or just thread. A screw is an inclined plane wrapped...

Intended Use
Threaded rod is designed for use in constructing things. It is meant to hold things together, to suspend things, or to run through things for internal strength. They are designed to have washers and nuts ...

In general, a screw is driven by a screwdriver, alien wrench, or other device whose tip fits into an opening in the head of the fastener. The shaft may be cylindrical or conical, but whatever its shape it has helical ...